Process of making paint.



UNITED STATES DAVID J. OGILVY, OF CINCINNATI, OHIO.

PROCESS OF MAKING PAINT.

SPECIFICATION forming part of Letters Patent N 0. 701,378, dated June 3, 1902. Application filed June 28, 1899. serial No. 722,133. (No specimens.)

To all whom it may concern:

Be it known that I, DAVID J OGIL VY, a citi zen of the United States, and a resident of the city of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Manufacturing Zinc-Oxid Paints, of which the following isa specification.

The object of this invention is to manufacture paints and the like by a much quicker and more economical process and with more satisfactory results than has been heretofore obtained. This object I attain by exposing the vehicle and pigment to an elevated temperature combined with cording to the following specification until the pigment has been thoroughly impregnated with the hot vehicle and the mixture has arrived at a proper state of liquidity, so as to be available for any desired treatment, such as straining, grinding, or mixing.

The process is as follows: Into a convenient vessel, which may be either in the form of a distilling apparatus or an open pan sufficiently deep to leave ample working room, introduce about forty per cent. raw linseed-oil and sixty per cent. zinc-white. Then into the mass of pigment and oil inject superheated steam until the mixture has been sufiiciently levigated and heated. A temperature ranging from 350 to 450 Fahrenheit will generallysuffice to render the product amply liquid to be strained through a No. 150 metal mesh, and a still finer mesh may be used if a still higher temperature is attained, while for temperatures below 350 Fahrenheit a coarser mesh is applicable. The straining may be assisted by air or mechanical pressure.

The time required to conduct the process need not be longer'than when the proper point for straining has arrived; but to continue the heating is advantageous in so far that it levigates the mixture to a greater degree, and while there is a risk of loss by volatilizing the vehicle this may be overcome by passing the vapors through a condenser.

The proportions given are subject to variation depending on the nature of the vehicle and zinc oxid, as also the proportions in the mixture of any other ingredients such as are generally used for tinting or filling zincwhites or for altering the working qualities and cost.-

violent agitation ac,

color.

When lead pigments are present in the zincwhite, it is advisable to conduct the process at 300 Fahrenheit, or thereabout, as it lessens the risk of darkening and saponification. Apreliminary trial of the pigment will quickly decide the best limit.

The product from this process may be used either for paints or printing-inks, depending on the proportions of the pigment present and the kind of vehicle used. For paints, linseed and poppy oils are preferred, and for printing-inks rosin and petroleum and lin seed oils, and in either case resins may be used to produce proper viscosity and gloss.

It is not essential that the product from this treatment must be strained or ground, the result being in many cases amply levigated for ordinary use.

Among the advantages of this invention are: The body and opacity of the zinc oxid is improved, thereby increasing its value as a pigment. The product from this method is rendered quicker-drying and also brighter in The zinc-white can be used in .moist or pulp form, this being an important hygienic feature. Greater speed and economy and more perfect mingling of the materials in the product can be obtained than by the old method of grinding.

What I claim as new and of my invention, and desire to secure by Letters Patent, is-

1. The process of making zinc-oxid paints, whichconsists in treating zinc-white and a suitable vehicle with high-pressure or superheated steam injected into the mass until the mixture has been sufficiently levigated and heated so as to be in a proper condition for straining or other treatment, specified.

2. The process of making mixtures and combinations of zinc oxid and the proper vehicle consisting in heating and levigatingzinc oxid in a tinted dyed or mixed condition and a suitable vehicle with injected high-pressure or superheated steam, until the result has been sufficiently levigated and in a condition to be strained or otherwise treated, substantially as specified.

DAVID J. OGILVY.

Attest:

PHILIP O. SWING, K. SMITH.

substantially as 

